of course your lights will dim at an idle the HO probally puts out the same amount at idle but at 1500-2000 rpms it puts out a max of 220-240 so your fine, all alternators run like this so its not a problem with the battery, and also the optima batterys work great and they can be drained and recharged with no problem there ment for that type of stuff. i just put a yellow top in my trunk so i dont have anylight dimming peroid.
